[lazyeye]

This sounds like a great example of "motivated reasoning". In almost any profession that requires some form of repetitive movement you are going to suffer physical deterioration with time beyond what is considered normal ageing. Excessive neck movement will be no different.

[lukas099]

Who suffers more 'physical deterioration', someone who walks 1 mile every day (about as repetitive as movement gets) or someone who is bedridden?

You're not a car, you're an adaptable organism.

[lazyeye]

A person who runs all day, every day, from the hours of 9 to 5, for decades, suffers the most 'physical deterioration'.